diff --git a/include/atomic b/include/atomic
index b36aee232..97089776a 100644
--- a/include/atomic
+++ b/include/atomic
@@ -21,8 +21,12 @@ namespace std
 
 typedef enum memory_order
 {
-    memory_order_relaxed, memory_order_consume, memory_order_acquire,
-    memory_order_release, memory_order_acq_rel, memory_order_seq_cst
+    memory_order_relaxed,
+    memory_order_consume,  // load-consume
+    memory_order_acquire,  // load-acquire
+    memory_order_release,  // store-release
+    memory_order_acq_rel,  // store-release load-acquire
+    memory_order_seq_cst   // store-release load-acquire
 } memory_order;
 
 template <class T> T kill_dependency(T y);
@@ -2412,6 +2416,19 @@ void atomic_signal_fence(memory_order);
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
+typedef enum memory_order
+{
+    memory_order_relaxed, memory_order_consume, memory_order_acquire,
+    memory_order_release, memory_order_acq_rel, memory_order_seq_cst
+} memory_order;
+
+template <class _Tp>
+inline _LIBCPP_INLINE_VISIBILITY
+_Tp
+kill_dependency(_Tp __y)
+{
+    return __y;
+}
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/test/atomics/atomics.general/nothing_to_do.pass.cpp b/test/atomics/atomics.general/nothing_to_do.pass.cpp
new file mode 100644
index 000000000..b85601fc4
--- /dev/null
+++ b/test/atomics/atomics.general/nothing_to_do.pass.cpp
@@ -0,0 +1,13 @@
+// -*- C++ -*-
+//===-------------------------- algorithm ---------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+int main()
+{
+}
diff --git a/test/atomics/atomics.order/kill_dependency.pass.cpp b/test/atomics/atomics.order/kill_dependency.pass.cpp
new file mode 100644
index 000000000..f51b0f544
--- /dev/null
+++ b/test/atomics/atomics.order/kill_dependency.pass.cpp
@@ -0,0 +1,21 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <atomic>
+
+// template <class T> T kill_dependency(T y);
+
+#include <atomic>
+#include <cassert>
+
+int main()
+{
+    assert(std::kill_dependency(5) == 5);
+    assert(std::kill_dependency(-5.5) == -5.5);
+}
diff --git a/test/atomics/atomics.order/memory_order.pass.cpp b/test/atomics/atomics.order/memory_order.pass.cpp
new file mode 100644
index 000000000..9650d45bf
--- /dev/null
+++ b/test/atomics/atomics.order/memory_order.pass.cpp
@@ -0,0 +1,31 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <atomic>
+
+// typedef enum memory_order
+// {
+//     memory_order_relaxed, memory_order_consume, memory_order_acquire,
+//     memory_order_release, memory_order_acq_rel, memory_order_seq_cst
+// } memory_order;
+
+#include <atomic>
+#include <cassert>
+
+int main()
+{
+    assert(std::memory_order_relaxed == 0);
+    assert(std::memory_order_consume == 1);
+    assert(std::memory_order_acquire == 2);
+    assert(std::memory_order_release == 3);
+    assert(std::memory_order_acq_rel == 4);
+    assert(std::memory_order_seq_cst == 5);
+    std::memory_order o = std::memory_order_seq_cst;
+    assert(o == 5);
+}
diff --git a/test/atomics/atomics.syn/nothing_to_do.pass.cpp b/test/atomics/atomics.syn/nothing_to_do.pass.cpp
new file mode 100644
index 000000000..b85601fc4
--- /dev/null
+++ b/test/atomics/atomics.syn/nothing_to_do.pass.cpp
@@ -0,0 +1,13 @@
+// -*- C++ -*-
+//===-------------------------- algorithm ---------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+int main()
+{
+}